End wall arrangement for seal end carton



July 19 1956 |f A., cHlDsEY, JR 3,261,534

END WALL ARRANGEMENT FOR SEAL END CARTON Filed March 18, 1964 .fraz/672.2157@ www@ United States Patent O 3,261,534 END WALL ARRANGEMENTFOR SEAL END CARTGN I Francis A. Chidsey, Jr., Devon, Pa., assigner toContainer Corporation of America, Chicago, Ill., a corporation ofDelaware Filed Mar. 18, 1964, Ser. No. 352,781 6 Claims. (Cl. 229-31)This invention relates to folding cartons, and more particularly to theend wall construction of a carton.

The invention comprehends an improved arrangement for the end wall of acarton having cover and tray portions with overlapped, interconnectedflaps forming the end wall of the carton.

One of the problems normally encountered in forming a seal end carton isthat of maintaining an effective seal between an outer ap and theintermediate and inner flaps of the end walls, because the intermediateflaps act as spacers which prevent full surface contact between opposingsurfaces of the inner and outer flaps.

It is therefore on object of this invention to provide, in a seal endcarton, a means 1for maintaining a portion of the end wall inner flapouter surface in co-planar relationship with the outer surfaces of theintermediate flaps and the inner surface of the outer flap to insure auniform adhesive bond between ila-ps.

A more specific object of the invention is to provide, in a carton ofthe type described, an inner flap hinged to the bottom wall `of thecarton along a hinge line the central portion of which is deflectedoutwardly to cause the central portion of the inner flap to bowoutwardly so that its outer surface will be ico-planar with the outersurfaces of the intermediate flaps of the carton end wall.

These and other objects of the invention will be apparent from anexamination of the following description and drawings, wherein:

FIGURE 1 is a perspective view-of a folding carton embodying features ofthe invention, with portions of the structure broken away;

FIGURE 2 is a horizontal section taken on line 2 2 of FIGURE 1;

FIGURE 3 is a plan view of the blank from which the carton of FIGURE lmay be formed; and

FIGURES 4, 5 and 6 are views corresponding to FIG- URES l, 2 and 3,respectively, but which illustrate a modified form of the invention.

It will be understood that, for purposes of clarity, certain elementshave been intentionally omitted from certain views where they areillustrated to better advantage in other views.

Referring now to the drawing for a better understanding of theinvention, it will be seen that the carton or container, indicatedgenerally at C, shown in FIGURE l of the drawing includes integral trayand cover or lid portions T and L, respectively, which may be formedfrom the single blank B of foldable paperboard illustrated in FIGURE 3.

The tray portion of the container includes a generally rectangularbottom wall having lopposed front and rear side wall panels 12 and 14,respectively, hinged to and upstanding from the front and rear sideedges thereof and having end walls 16 hinged to and upstanding from theend edges thereof.

Each end wall 16 includes an inner flap 20 hinged to the related endedge of bottom wall panel 10 along a hinge line 40, and a pair ofintermediate ilaps 22 hinged to the related end edges of the front andrear side wall pane-ls 12 and 14. Intermediate flaps 22 may be formed asa double gusset or bellows comprising a pair of triangular flaps 22a'and 22b hinged to the related side wall and inner ilap, respectively,and hinged to each "ice other along a diagonal fold line extending fromthe corner of bottoni wall panel 10 to the related corner of the blank.

The cover or lid portion of the tray includes a generally rectangulartop wall panel 30 hinged at its rear edge to the upper edge of rear sidewall 14 and having hingedly attached to and depending from its frontside edge and end edges a front panel 32 and a pair of end panels 34adapted to overlie and be adhesively secured to the front side wall 12and the end walls 16, respectively, of the tray portion of a container.

As best seen in FIGURE 3, each hinge line 40, on which each end wallinner flap 20 is attached to the related edge of bottom wall panel 10,includes marginal or end sections 42 which converge outwardly frombottom wall panel 10 and la center or medial sec-tion 40 which isdeflected outwardly a slight distance toward the free outer edge ofinner flap 20. The purpose of this icontoured hinge line is to cause thecenter portion 48 of inner ap 20 to bow outwardly from the end ormarginal portions 46 of :the inne-r flap so that it will present anouter surface which is Ico-planar with the outer surfaces ofintermediate flaps 22 and the inner surface of panel 34, as illustratedin FIGURE 2 of the drawing.

In Iconventional carton construction it will be understood that theintermediate ilaps actas spacers which prevent the outer surface of eachinner flap 20 from coming into complete full-face engagement with therelated adjacent portion of the inner surface of top wall end panel 34,which is in reality an outer flap of the container end wall when thecontainer is in erected, sealed condition.

Thus, as best seen in FIGURES 2 and 3, by virtue of the novel hinge linearrangement ffor the carton inner flap its glue area 50 is `co-planarwith the glue areas 52 of the intermediate flaps to form a more completeand uniform glue surface for attachment to the inner surface of covertop wall panel 34.

Referring now to FIGURES 4, 5 and 6 of the drawing, which illustrate aslightly modified form of the invention, it wil-l be seen that all ofthe portions of this embodiment have been designated by numerals similarto those used to designate corresponding portions of the firstembodiment.

The only difference between the embodiment of the invention illustratedin FIGURE 4 is that the tray portion end wall intermediate flaps 22 aresingle flaps hinged only to the front and rear side walls of the tray,and are generally rectangular in shape having no hinge attachment to endwall inner flap 20.

In this embodiment each inner flap 16 is also hinged to the related endedge of bottom wall panel 10 along an outwardly deflected score linewhich causes the central portion of inner flap 20 to bow outwardly andpresent an outer surface which is substantially co-planar with the outersurfaces of intermediate flaps 22 and the inner surface of flap 34 inthe same manner as that of the previously described embodiment.

Thus, it will be understood that by means of the novel contoured hingeline attaching the inner end wall flaps to the bottom wall of the cartonit is now possible to achieve a more complete and uniform sealingarrangement for the end walls of the carton.

What is claimed is:

1. A collapsible container formed `from a unitary blank olf foldabflepaperboard, comprising:

I(a) a tray portion including a bottom wall and opposed pairs lof sideand end walls;

(ib) a cover portion including a top wall panel hinged at one side edgeto the upper edge `of yone of said said walls and having side and endclosure panels hinged to and depending from the other side edge and endedges, respectively, of said top wall panel for adhesive engagement withthe other side wall and the end walls, respectively, of said trayportion;

(c) each end wall of said tray portion including an inner Hap hinged toan end edge of said bottom wall and folded upwardly normal to saidbottom wall and a pair of intermediate naps 'hinged to corresponding endedges of respective side walls and `folded inwardly normal to said sidewalls to overlie marginal portions of said inner panel;

(d) each inner flap being attached to said bottom wall, on a hinge linewhich has marginal Sections and a medial section `deiieoted outwardlyfrom the marginal sections, and having a medial portion bowed outwardlyfrom its marginal port-ions to present an outer surface substantiallyco-planar with the outer surfaces of -said intermediate iiaps.

2. A collapsible container formed -from a unitary blank of foldablepaperboard, comprising:

(a) a tray portion including a bottom wall and Opposed pairs of side andend walls;

(lb) a cover portion including a top wall panel hinged -at one side edgeto the upper edge of one of said side walls and having side and endclosure panels hinged to and depending from the other side edge and endedges, respectively, of said top wall panel for adhesive engagement withthe other side wall and the end walls, respectively, of said trayportion;

(c) each end wall of said tray portion including an inner ap hinged toan end edge of said bottom wall and folded upwardly normal to saidbottom wall and a pair of intermediate flaps hinged to corresponding endedges of respective side walls and folded inwardly normal to said sidewalls to overlie marginal portions of said inner panel;

(d) each inner :flap having a medial portion bowed outwardly from itsmarginal portions to present an outer surface substantially co-fplanarwith the outer surfaces of said intermediate flaps.

3. A collapsible container formed lfrom a unitary blank of foldablepaperboard, comprising:

(a) top and bottom walls and Opposed pairs of side and end walls;

(b) each end wall including an inner flap hinged to an end edge lof saidbottom wall and folded upwardly normal yto said bottom wall, a pair ofintermediate flaps hinged to corresponding end edges of respective sidewalls and folded inwardly normal to said side walls to overlie marginalportions of said inner panel, and 'an outer iiap hinged to an end edgeof said top wall and folded downwardly to overlie said inner andintermediate flaps in adhesive engagement therewith;

(c)` each inner diap being attached to said bottom wall, on a hinge linewhich has marginal sections and a medial section deflected outwardlyfrom the marginal sections, and 'having a medial portion bowed out-`wardly from its marginal portions to present an outer surfacesubstantially co-planar with the outer surrfaces of said intermediateaps.

4. A collapsible container formed rfrom a unitary blank of tfoldablepaperboard, comprising:

normal to said bottom wall, a pair of intermediate iiaps hinged tocorresponding end edges of respective side walls and folded inwardlynormal to said side walls to overlie marginal portions of said innerpanel, and an outer ap hinged to an end edge of said top wall and folded`downwardly to overlie said inner and intermediate iiaps in adhesiveengagement therewith;

(c) each inner flap having a medial portion bowed out-wardly from itsmarginal portions to present an outer surface substantially co-planarwith the outer surfaces of said intermediate aps.

5. A collapsible container formed from a unitary blank of foldalblepaperboard, comprising:

(a) horizontal top and bottom walls and opposed pairs off vertical sideand end walls;

(b) each end wall including an inner flap hinged to an end edge ofsaid'bottom wall and -folded upwardly normal to said bottom wall, a pairof intermediate flaps hinged to corresponding end edges of respectiveside walls and folded inwardly normal to said side walls to overliemarginal portions of said inner panel, and an outer flap hinged to anend edge of said top wall and -folded downwardly to overlie said innerand intermediate aps in adhesive engagement therewith;

(c) one of said inner and outer aps being attached to its relatedIhorizontal wall, on a hinge line which has marginal sections and amedial section deec-ted out of the plane of its marginal sections, andhaving a medial portion bowed out of the plane of its marginal portionsto present a surface substantially.

co-planar with related surfaces of said lintermediate flaps. `6. Acollapsible container formed from a unitary blank of foldablepaperboard, comprising:

(a) horizontal top and bottom walls and opposed pairs (c) one of saidinner and outer flaps having a medial portion bowed out of the plane ofits marginal portions toward the other of said inner and outer aps topresent a surface substantially co-planar with related surfaces of saidintermediate flaps.

References Cited by the Examiner UNITED STATES PATENTS 9/ 1964 Steiger229-36 FOREIGN PATENTS 983,067 6/1951 France.

JOSEPH R. LECLAIR, Primary Examiner.

5 R. PESHOCK, Assistant Examiner.

6. A COLLASPIBLE CONTAINER FORMED FROM A UNITARY BLANK OF FOLDABLEPAPERBOARD, COMPRISING: (A) HORIZONTAL TOP AND BOTTOM WALLS AND OPPOSEDPAIRS OF VERTICAL SIDE AND END WALLS; (B) EACH END WALL INCLUDING ANINNER FLAP HINGED TO AN END EDGE OF SAID BOTTOM WALL AND FOLDED UPWARDLYNORMAL TO SAID BOTTOM WALL, A PAIR OF INTERMEDIATE FLAPS HINGED TOCORRESPONDING END EDGES OF RESPECTIVE SIDE WALLS AND FOLDED INWARDLYNORMAL TO SAID SIDE WALLS TO OVERLIE MARGINAL PORTIONS OF SAID INNERPANEL, AND AN OUTER FLAP HINGED TO AN END EDGE OF SAID TOP WALL ANDFOLDED DOWNWARDLY TO OVERLIE SAID INNER AND INTERMEDIATE FLAPS INADHESIVE ENGAGEMENT THEREWITH; (C) ONE OF SAID INNER OUTER FLAPS HAVINGA MEDIAL PORTION BOWED OUT OF THE PLANE OF ITS MARGINAL PORTIONS TOWARDTHE OTHER OF SAID INNER AND OUTER FLAPS TO PRESENT A SURFACESUBSTANTIALLY CO-PLANAR WITH RELATED SURFACES OF SAID INTERMEDIATEFLAPS.